How to do Code Deploy to ECS using a fargate two container in one task definition?

I have successfully deployed to ECS using a Fargate by using a single container. But when i try to deploy two container facing error. [ using a console ] ERROR: Site Cannot reached even, I had added that container port number in security group and attached it.

ACTION PERFORMED: Creation of Task defintion in that added a container name, image URI from ECR and define port mapping.